Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 hours. If 50.0 mg of I-123 were prepared at 8:00 A. M. on Monday, how many mg remain at 10:00 A. M. on the following day

12.5 mg

Explanation:

The half-life of Iodine -123 is 13 hours.

Between 8 am on Monday and 10 am on Tuesday will be 26 hours.

After the first 13 hours, the Iodine should be left with half of its initial quantity

= 50/2

= 25 mg

There are now 13 hours remaining meaning that the Iodine will be half of the 25mg after that period.

= 25/2

= 12.5 mg.

12.5 mg remain at 10 am the next day.

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answer

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